#pragma once

#include <iostream>
#include <string>
#include <cstring>
#include <cstdlib>
#include <cerrno>
#include <sys/types.h>
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netinet/in.h>

#include "Log.hpp"
#include "InetAddr.hpp"

enum
{
    SOCKET_ERROR = 1,
    BIND_ERROR,
    USAGE_ERROR
};

const static int defaultfd = -1;

class UdpServer
{
public:
    UdpServer(uint16_t port)
        : _port(port),
          _sockfd(defaultfd),
          _isrunning(false)
    {
    }

    void InitServer()
    {
        // 1. 创建udp socket 套接字 --- 必须要做的
        _sockfd = socket(AF_INET, SOCK_DGRAM, 0);
        if (_sockfd < 0)
        {
            LOG(ERROR, "create socket failed!\n");
            exit(SOCKET_ERROR);
        }
        LOG(INFO, "create socket success!\n");
        // 2.0 填充sockaddr_in结构
        struct sockaddr_in local;
        bzero(&local, sizeof(local));
        local.sin_family = AF_INET;
        local.sin_port = htons(_port);
        local.sin_addr.s_addr = INADDR_ANY;

        // 2.1 bind sockfd和网络信息(IP(?) + Port)
        int n = bind(_sockfd, (struct sockaddr *)(&local), sizeof(local));
        if (n < 0)
        {
            LOG(ERROR, "bind failed!\n");
            exit(BIND_ERROR);
        }
        LOG(INFO, "bind success!\n");
    }

    void Start()
    {
        _isrunning = true;
        while (true)
        {
            char buffer[1024] = {0};
            struct sockaddr_in peer;
            socklen_t len = sizeof(peer);
            ssize_t n = recvfrom(_sockfd, buffer, sizeof(buffer) - 1, 0, (struct sockaddr *)(&peer), &len);
            if (n > 0)
            {
                buffer[n] = 0;
                InetAddr addr(peer);
                LOG(DEBUG, "get message from [%s:%d]: %s\n", addr.Ip().c_str(), addr.Port(), buffer);
                // 2. 我们要将server收到的数据，发回给对方
                sendto(_sockfd, buffer, strlen(buffer), 0, (struct sockaddr *)&peer, len);
            }
        }
        _isrunning = false;
    }

    ~UdpServer() {}

private:
    int _sockfd;
    int _port;
    bool _isrunning;
};